Mariah Carey slammed on Twitter by fans accusing her of lip syncing her '90s Christmas hit

Looks like Mariah Carey's voice hasn't changed a bit since she released her 1994 hit 'All I Want for Christmas is You'…

Or has it? Watch the clip above from the Macy's Thanksgiving Day Parade in New York City to decide for yourself.

The 45-year-old's performance on the float caused quite a stir on social media for her apparent lip syncing.

"Amazing – Mariah Carey sounds just like she did in 1994," @CLEvival wrote to Twitter. "#lipsync #originalrecording."